For Marsden, fundamentalists are not just religious conservatives; they are conservatives who are willing to take a stand and to fight. In Marsden's words (borrowed by Jerry Falwell), "a fundamentalist is an evangelical who is angry about something." In the late nineteenth century American Protestantism was gradually dividing between liberals who were accepting new scientific and higher critical views that contradicted the Bible and defenders of the more traditional evangelicalism. By the 1920s a full-fledged "fundamentalist" movement had developed in protest against theological changes in the churches and changing mores in the culture. Building on networks of evangelists, Bible conferences, Bible institutes, and missions agencies, fundamentalists coalesced into a major protest movement that proved to have remarkable staying power.

For this new edition, a major new chapter compares fundamentalism since the 1970s to the fundamentalism of the 1920s, looking particularly at the extraordinary growth in political emphasis and power of the more recent movement. Never has it been more important to understand the history of fundamentalism in our rapidly polarizing nation. Marsen's carefully researched and engrossing work remains the best way to do just that.